i see the following problems after #20281 ( Platform: Windows 10.0.19042 AMD64 )

1. imshow( winname, img ) ( without prior namedWindow ) by default the window was created with the cv::WINDOW_AUTOSIZE flag. now the window is resizable!
2. [Windows Backend Only] Pressing Ctrl+S will show a dialog to save the image. don't work.
3. [Windows Backend Only] Pressing Ctrl+C will copy the image to the clipboard. copies the image to the clipboard but triggered waitKey() as a key pressed. i think it was waiting another key press before..